Swingable supported drafting rolls



May 29, 1962 W. NAEGELI SWINGABLE SUPPORTED DRAFTING ROLLS 4Sheets-Sheet 1 Filed March 9, 1959 INVENTOR. VVEENEi-E MEGEL BY flaw w.NAEGELl SWINGABLE SUPPORTED DRAFTING ROLLS May 29,1962

4 Sheets-Sheet 2 Filed March 9, 1959 INVENTOR. VVZ-PNEE MEGELI.

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May 29, 1962 w. NAEGELl SWINGABLE SUPPORTED DRAFTING ROLLS Filed March9, 1959 4 Sheets-Sheet 3 1.- INVENTOR.

V VEP'NEE NAEGELA BY HTT'OENEK May 29, 1962 I w. NAEGELI SWINGABLESUPPORTED DRAFTING ROLLS 4 Sheets-Sheet 4 Filed March 9, 1959 INVENTOR.WE/PNEI? NHEGELI.

flfTO/PNEK United States Patent Office 3,035,345 Patented May 29, 19 623,036,345 SWINGABLE SUPPORTED DRAFTING ROLLS Werner Naegeli, Winterthur,Switzerland, assignor to Job.

Jacob Rieter & Co., Winterthur, Switzerland, a corporation ofSwitzerland Filed Mar. 9, 1959, Ser. No. 797,968 Claims priority,application Switzerland Mar. 12, 1958 9 Claims. (Cl. 19-261) The presentinvention relates to a drafting arrangement for spinning machines.

In conventional drafting arrangements the position of the drawingrollers in the plane of the drafting field can be changed by moving thebearings of the drawing rollers in the roller stand and fixing thebearings in the desired positions. The characteristics of the draftingarrangement, which determine the guidance of the spinning material andconsequently the quality of the drafting process, are not changed whenthe length of the drafting field is increased. The overall conditions,however, are made worse because of the change of the ratio between thecontrolled or guided length of the spinning material and theuncontrolled length of the spinning material.

The drafting arrangement according to the invention overcomes thedisadvantages of the conventional arrangements by swingably supportingbelow the drafting field a group of drafting and top rolls forming atleast one nip. A plurality of groups of drafting rolls and top rolls maybe supported swingable on the same axis whereby the loading means forthe top rolls swings simultaneously with the groups and remainsoperative in any position within predetermined limits.

The drafting arrangement according to the invention is technologicallyadvantageous because the length of the fibrous material which is incontact with the drawing roll becomes greater at increasing distancebetween the hips, when a more effective guidance is needed. Adjustmentof the length of the drafting field is considerably simplified by thearrangement according to the invention. Exact setting is facilitated bya curved scale mounted on the machine .frame on which scale the positionof a line moving with the rockable group of rolls can be seen.

The drive is so arranged that, when the distance between the nips ischanged without changing the drafting conditions, nothing need bechanged on the transmission. This is made possible by the rockablearrangement of the roller groups whereby the pinions mounted on thedrafting roller extensions roll on their driving gears which are coaxialof the rocking axis.

The novel features which are considered characteristic of the inventionare set forth with particularity in the appended claims. The inventionitself, however, and additional objects and advantages thereof will bestbe understood from the following description of an embodiment thereofwhen read in connection with the accompanying drawing, in which:

FIG. 1 is a perspective view of a drafting arrangement according to theinvention.

FIG. 2 is a large scale view of a detail of the drafting arrangementshown in FIG. 1 with parts broken away.

FIG. 3 is a diagrammatic perspective illustration of the drive of thedrafting arrangement shown in FIGS. 1 and 2.

FIG. 4 is a diagrammatic illustration of the drafting arrangement soadjusted that the drafting field is relatively short.

FIG. 5 is a diagrammatic illustration of the drafting arrangement soadjusted that the drafting field is relatively long.

Like numerals designate like parts in all figures.

Referring more particularly to the drawing, numeral .1

designates a frame including equally spaced roller stands 2 betweenwhich the drafting arrangements are located. Each drafting arrangementincludes a slowly rotating drafting roll 3 and a top roll 4, forming afeed roller pair 5. The drafting rollers 3 of each drafting roller groupare supported by hearing heads 7 individually mounted on arms 6 (FIG.2). The top roll 4 is provided with trunnions -8 and 9 supported byholders 10, 11, respectively, which are guided to move substantially inthe direction of the load. The arms 6 which are made fast to a pipe 13by means of screws 12, are arranged on the left side of the respectivesupports 2 as seen in FIGS. 1 and 2. The pipe 13 extends through alljuxtaposed drafting arrangements of the spinning machine and isrotatably loosely supported in bores 14 in the supports or stands 2. Thearms 6, the drafting rolls 3, and the pipe 13 form rigid systems whichare rockable on the axis of the pipe 13. Inside the latter is a hose 16inside of which there is a pressurized medium pressing the hose indownward direction against a shoe 17, one of which is provided for eachsystem. The shoes act on linkages 18 'which transmit the pressureexerted by the hose 16 as load to the respective trunnions 8, 9 of a toproll. Holders 10, 11, which are bolted to the respective linkages 18 andwhich are individually provided with a groove 8, rest like saddles onthe respective trunnions 8, 9. Each linkage 18 extends through a bore 19in the bearing head 7 to the respective holder 10, 11 wherebyparallelism with the feed roller 3 is assured. 7

As seen in FIGS. 1 and 2 the bearings for two adjacent coaxial draftingrollers form a unit. The bearings for the respective top rollers,however, are separated to facilitate individual removal of the toprolls.

An arcuate slot 20 is provided in the upper part of each roller stand 2for receiving an arresting bolt 21 extending from the arm 6. Washers 22and a nut 23 serve for fixing the bolt 21 and thereby the arm 6 in adesired position on the stand 2. Scales 24 and 25 provided on the upperridge of the stands 2 facilitate adjustment of the position of thebearing heads 7. If the bearings for the coaxial drafting rollers areinterconnected it is sulficient to provide scales only on the firststand 2 which is at the driving end of the machine and on the laststand.

If there is one top roller resting on two drafting rollers, the grooves8' can be omitted in the respective holders as shown in FIG. 1 inconnection with the top roll 28 resting on two drafting rollers 26 and27 and forming a roller trio 29. The rollers 26 and 27 are supported ina bearing head 30 supported by an arm 31 which is located on the rightside or forward of the support 2. The lower portion 32 of the arm 31 isrelatively wide and is rigidly connected to a pipe 3-3 extending throughthe entire machine. The arm 31 is not connected to the pipe 13 and canswing thereon (FIG. 2). The pipe 33 contains a hose 34 which presses ona shoe corresponding to the shoe 17 whereby the pressure is transmittedthrough a linkage 36 guided in a bore 35 in the bearing head 30 to thetop roller holders 37, 3-8, respectively. The arm 31 with theenlargements 32, the pipe 33- and the pair of drawing rollers 26 and 27form a rigid unit which is rockable on the axis 15 of the pipe 13. Thisunit can be arrested by means of an arresting bolt 39 extending throughthe slot 20 (FIG. 2). Each support 2 has an aperture 40 through whichthe pipe 33 extends and which is so large that the arm 31 with the pipe33 can be swung to an extreme position corresponding to the longestfibres or the greatest distance between the nips formed by the rollerpair 5 and the roller trio 29.

A delivery roller trio 41 comprising drafting rollers 42, 43 and a toproll 44 is not movable relatively to the support 2, the drafting rollersbeing rotatably supported 3 7 in a bearing block 45 forming part of thesupport 2. The top roll 44 is loaded by a load producing system 46 fromwhich the load is transmitted through a linkage 47 to saddles resting onthe trunnions of the top roll similar to the loading arrangement for thetop rolls 4 and2x8. V I

All drafting rollers are drivenby a drive shaft 48 (FIG. 3). The largerone (-49) of a double gearSt) mountedon the shaft 48 transmits rotationthrough a pinion 51 to the delivery roller 42 wherefrom rotation istransmitted through a connecting gearing :52 to thesecond deliveryroller 43. The smaller one (53) of the double gear 50 engages a gear 54mounted on a shaft 55 extending from the feed drafting roller 3 andconnected to the shaft 48 by a rocking'lever or link 56. A second gear57 mounted on the shaft 55 engages the smaller one (58) of a double gear59 which is rotatable on the main shaft 48. The larger one (60) of thedouble gear 59 engages a pinion 61 which is coaxial of and rigidlyconnected to the drafting roller 26. The pinion 61 is mounted on anextension of the roller 26 which extension is swingably said arms beingswingably supported by said roller stands connected to the shaft 48 bymeans of a rocking lever 62 g which also supports a connecting gearing63 and an extension 64 of the second drafting roller 27 driven by thepinion 61 through thegearing 63. If the positions of the roller units 5and 29 are changed, the levers 56 and 62 are swung through the sameangle as the arms 6 and 31. The gears54, 57 and 61 when the respectivedouble gears 50 and 59. There is no change gear and no axialdisplacement of gears. c 7

The mechanism according to the invention is schematically shown in FIGS.4 and 5.

A narrow adjustment of the drafting arrangement as required for shortstapled fibre material is shown in FIG. 4 whereas FIG. 5 shows the:relative positions of the elements of the mechanism suitable for longstapled material. I a

FIGS..4 and 5 show the angle athrough which the fibrous material engagesthe second drafting rollers 27 of the unit 29, whereby the angle at asmeasured from the nip of the rollers 27, 28, becomes greater uponrocking of the system on the axis 15 through the angle gamma forincreasing the length of the drafting field whereby guidance of thematerial is improved. 6 The same is the case at the feed roller pair.The angle of engagement pincreases with increasing anglegammaf Swingingof the roller trio 29 as well as of the. roller pair 5 one common axisimproves guidance of the fibrous material upon increasing length of thedrafting field which" is of great importance when the speed of movementof the material is great. r

What is claimed is: p 7

1. A drafting arrangement for spinning machines com prisingdraftingrollers forming at least two roller groups forming a draftingfield between the nips of the'roller groups, atleast'one of'said groupsbeing swingably supported below the drafting field and guided to move onan 7 arcuate path for changing the distance between the roller groups;whereby the angular extent of engagement of the drafted material withthe drafting roller of the group is and pairwise carrying said swingablysupported roller s p- 3. A drafting arrangement according to claim 2including an element rigidly connecting said arms and beingoscillatingly supported by said roller stands.

4. A drafting arrangement according to claim 3 in which each rollergroup includes a top roll, load producing means being operativelyconnected to said element, and load transmitting means being provided,individually interconnecting said load producing means and the top rollof the swingably supported group.

5. A drafting arrangement according to claim 4 wherein said loadtransmitting means are individually guided in the upper portions of saidarms. I

a 6. A drafting arrangement according to claim 3 in which each rollergroup includes a top roll, load producing means being operativelyconnected to said arms; and load transmitting means being provided,individually interconnecting said load producing means and the top rollof the swingably supported group whereby said load producing means andsaid load transmitting means are swingable on the same axis as saidarms.

7. A drafting arrangement according to claim 6' wherein said loadtransmitting means are individually guided in the upper portions of saidarms.

8. A drafting arrangement as defined in claim 1 wherein each rollergroup includes a draftingroller and a top roller, a main drive shaftbeing placed coaxially of the swing axis of the swingably supportedroller group, driving gears being rigidly connected to said main driveshaft, gears being coaxially connected to the drafting roller of theswingably supported group'and' individually engaging said driving gearsand rolling thereon upon swinging of said swingable group.

'9. A drafting arrangement for spinning machines comprising draftingrollers forming: at least two roller groups forming a drafting fieldbetween the nips of the roller groups, said groups being coaxiallyindividually swingably supported below the drafting field and guided tomove on an arcuate path for changing the distance between the rollergroups whereby the extent of engagement of the drafted material with thedrafting rollers of said groups 'is increased upon increase of thelength of the drafting field between said groups'and is'decreased' upondecrease of the length of the drafting field between said groups.

References Cited in the file of this patent

